"This wrapped style originates from Microsoft®. There is no specification
that defines this style; so while this style is a good thing,
unfortunately, the only choice right now, in order to interoperate with
Microsoft's and other's implementations, is to make educated guesses as to
how it works based on the output of the Microsoft WSDL generator. This
pattern has been around for awhile, and the industry has done a good job
of understanding it, but while the pattern is fairly obvious in this
example, there are corner cases in which the proper thing to do is not
particularly clear. Our best hope is that an independent group like the
WS-I organization will help stabilize and standardize this in the future."

Given that there is no standard and that this is a MS specific pattern I
think it is out of scope of WTP to provide support for this binding. Of
course I'm no longer part of WTP leadership so perhaps someone like Kathy
Chan or Valentin Baciu would have a more official answer.

That said, if you want to use the binding you don't need to rely on the
wizard. Generate the WSDL, open the WSDL file, change to the source tab,
and make the required changes as outlined in the article.